Phineas and Ferb the Movie: Candace Against the Universe

When their older sister Candace is suddenly kidnapped by extraterrestrial beings, Phineas and Ferb launch a daring mission to bring her home. The siblings traverse the vast reaches of the galaxy, eventually locating her on a remote planet. This mysterious alien world serves as a utopian sanctuary where Candace finds herself blissfully separated from her bothersome younger brothers. As the boys navigate this strange environment to execute their rescue plan, they must overcome the challenges of deep space travel to reunite with their sibling and return her safely to their own world.